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add options to perturb the softbody patch's initial position

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Xuchen Han
2019-08-12 12:07:24 -07:00
parent cfbd6c512a
commit 9e6e571732
2 changed files with 11 additions and 3 deletions
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11
src/BulletSoftBody/btSoftBodyHelpers.cpp
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@@ -724,7 +724,8 @@ btSoftBody* btSoftBodyHelpers::CreatePatch(btSoftBodyWorldInfo& worldInfo, const
int resx, int resx,
int resy, int resy,
int fixeds, int fixeds,
bool gendiags) bool gendiags,
btScalar perturbation)
{ {
#define IDX(_x_, _y_) ((_y_)*rx + (_x_)) #define IDX(_x_, _y_) ((_y_)*rx + (_x_))
/* Create nodes */ /* Create nodes */
@@ -744,7 +745,13 @@ btSoftBody* btSoftBodyHelpers::CreatePatch(btSoftBodyWorldInfo& worldInfo, const
for (int ix = 0; ix < rx; ++ix) for (int ix = 0; ix < rx; ++ix)
{ {
const btScalar tx = ix / (btScalar)(rx - 1); const btScalar tx = ix / (btScalar)(rx - 1);
x[IDX(ix, iy)] = lerp(py0, py1, tx); btScalar pert = perturbation * btScalar(rand())/RAND_MAX;
btVector4 temp1 = py1;
temp1.setY(py1.getY() + pert);
btVector4 temp = py0;
pert = perturbation * btScalar(rand())/RAND_MAX;
temp.setY(py0.getY() + pert);
x[IDX(ix, iy)] = lerp(temp, temp1, tx);
m[IDX(ix, iy)] = 1; m[IDX(ix, iy)] = 1;
} }
} }

3
src/BulletSoftBody/btSoftBodyHelpers.h
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@@ -92,7 +92,8 @@ struct btSoftBodyHelpers
int resx, int resx,
int resy, int resy,
int fixeds, int fixeds,
bool gendiags); bool gendiags,
btScalar perturbation = 0.);
/* Create a patch with UV Texture Coordinates */ /* Create a patch with UV Texture Coordinates */
static btSoftBody* CreatePatchUV(btSoftBodyWorldInfo& worldInfo, static btSoftBody* CreatePatchUV(btSoftBodyWorldInfo& worldInfo,
const btVector3& corner00, const btVector3& corner00,